When I drive motor with PWM from MCU I heard a whine sound. Several people suggest to increase the PWM freq above audible range of human i.e 20Khz.
But one thing I dont understand human ear heard sound when there is compression/rarefaction around local region.
But PWM freq let say at 5Khz is electrical freq. It is not making any compression/rarefaction nearby. Then why this noise & how do human ear heard these?
Then if I rum MCU core at 10Khz low freq then it should also make noise? But when I do it, it dont make any noise
But one thing I dont understand human ear heard sound when there is compression/rarefaction around local region.
But PWM freq let say at 5Khz is electrical freq. It is not making any compression/rarefaction nearby. Then why this noise & how do human ear heard these?
Then if I rum MCU core at 10Khz low freq then it should also make noise? But when I do it, it dont make any noise